{% load cache %}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<h1>{{ ctime }}</h1>
<h1>{{ ctime }}</h1>

{% cache 10 c1 %}
<h1>{{ ctime }}</h1>
{% endcache %}

</body>
</html>